CN113281127A - Triaxial compression test sample saturation device for fine clay - Google Patents
Triaxial compression test sample saturation device for fine clay Download PDFInfo
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- CN113281127A CN113281127A CN202110700005.5A CN202110700005A CN113281127A CN 113281127 A CN113281127 A CN 113281127A CN 202110700005 A CN202110700005 A CN 202110700005A CN 113281127 A CN113281127 A CN 113281127A
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- 239000004927 clay Substances 0.000 title claims abstract description 26
- 238000012669 compression test Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000002360 preparation method Methods 0.000 claims abstract description 40
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 36
- 239000004816 latex Substances 0.000 claims abstract description 23
- 229920000126 latex Polymers 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 38
- 229920001971 elastomer Polymers 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 238000009423 ventilation Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 37
- 238000004904 shortening Methods 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 241000446313 Lamella Species 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a triaxial compression test sample saturation device for fine clay, which comprises a saturated water tank, a sample preparation device and a vacuum pump which are sequentially communicated, wherein a sample preparation assembly comprises an upper sample cap, a permeable stone, filter paper, a sample and a lower sample cap, the filter paper, the permeable stone and the upper sample cap are sequentially arranged on the upper surface of the sample from bottom to top, the filter paper, the permeable stone and the lower sample cap are sequentially arranged on the lower surface of the sample from top to bottom, and the outer surface of the sample preparation assembly is further wrapped with a latex film. The invention can realize the aims of shortening the saturation time of the soil sample, improving the saturation of the soil sample, eliminating the air between the latex film and the soil sample and enabling the latex film to be tightly attached.
Description
Technical Field
The invention relates to the technical field of triaxial soil sample saturation in geotechnical tests, in particular to a triaxial compression test sample saturation device for fine clay.
Background
The soil is a complex three-phase material system, wherein soil particles form a solid soil framework, water and gas are filled between pores of the soil particles, and when the pores between the soil particles are completely filled with water, a soil body is in a saturated state, and otherwise, the soil body is in an unsaturated state. The saturation of soil mainly refers to the process of converting soil from a non-saturated state to a saturated state. In the conventional geotechnical test, a sample is generally saturated and the saturation is ensured before the relevant geotechnical test can be carried out.
Common saturation methods for indoor geotechnical test samples include an immersion saturation method, a capillary saturation method, a water head saturation method, a vacuum pumping saturation method, a carbon dioxide saturation method, a degassed water method and a counter pressure saturation method. Different saturation methods can be adopted for soil bodies with different properties. For sandy soil (non-cohesive soil) with better water permeability, a soaking saturation method and a capillary saturation method can be generally adopted for saturation, and the sandy soil saturation and the saturation speed can be improved by combining other various saturation methods. As for the silt, the silt is the soil which is between sandy soil and cohesive soil and has special engineering properties, the specific surface area is small, the silt belongs to low plasticity, and the capillary phenomenon is active, so that the capillary saturation method is considered firstly, the required saturation degree is achieved by utilizing the capillary action of the silt, and the vacuum pumping saturation method and the carbon dioxide saturation method are adopted to shorten the saturation time and improve the saturation effect. For fine clay, as the particle structure of the clay is mostly flaky, the minerals are mostly flaky hydrophilic minerals (such as kaolinite, montmorillonite and the like), the clay has a large specific surface area, and the permeability coefficient is also different according to the different specific surface areas of the cohesive soil, and according to the clay permeability coefficient, the cohesive soil which is easy to permeate water and has the permeability coefficient larger than 10-4cm/s can adopt a capillary saturation method, and the cohesive soil with the permeability coefficient smaller than 10-4cm/s usually adopts a vacuum pumping saturation method.
Generally speaking, saturation methods such as a vacuum pumping saturation method, a carbon dioxide saturation method, a counter pressure saturation method and the like can basically meet the requirement of soil sample saturation in engineering tests. But still has the problems that the saturation time is too long, the saturation degree can not meet the requirement under special conditions, the saturated soil sample is not tightly attached to the latex film and the like. Aiming at the problems, the invention designs the soil sample saturation device according to the existing saturation method to form a set of triaxial compression test sample saturation device aiming at fine clay, which can effectively eliminate air between a latex film and the soil sample during traditional sample loading, improve the sample saturation, shorten the sample saturation time and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a triaxial compression test sample saturation device for fine clay, which can achieve the aims of shortening the saturation time of a soil sample, improving the saturation of the soil sample, eliminating air between a latex film and the soil sample and enabling the latex film and the soil sample to be tightly attached.
The purpose of the invention is realized by the following technical scheme: a triaxial compression test sample saturation device for fine clay comprises a saturated water tank, a sample preparation device and a vacuum pump, wherein a first connector, a first connecting pipe, a second connector and a first ball valve are sequentially connected between the saturated water tank and the sample preparation device, a second ball valve, a third connector and a second connecting pipe are sequentially connected between the sample preparation device and the vacuum pump, the sample preparation device comprises a fixer and a sample preparation assembly, the fixer comprises a cover body and two fixing flaps, the two fixing flaps and the cover body are combined to form the fixer with a hollow structure inside, the cover body and the fixing flaps are matched to form a closed cavity, the sample preparation assembly is arranged in the closed cavity, the first connector is installed on the saturated water tank, and the first connector is communicated with the first connector through the first connecting pipe, the water inlet end of the first ball valve is communicated with the second connector, the water outlet end of the first ball valve is communicated with the bottom of the fixed valve, the water inlet end of the second ball valve is communicated with the bottom of the fixed valve, the water outlet end of the second ball valve is communicated with the third connector, and the third connector is communicated with the vacuum pump through a second connecting pipe;
sample preparation subassembly includes sample cap, permeable stone, filter paper, sample, lower sample cap, supreme setting gradually is down followed to the sample upper surface filter paper permeable stone with go up the sample cap, the sample lower surface sets gradually from last to down filter paper permeable stone with sample cap down, sample preparation subassembly surface still wraps up there is the emulsion membrane.
According to one preferred scheme, a third ball valve is arranged at the upper end of the fixed valve, the third ball valve and the second ball valve are symmetrically arranged on the outer surface of the fixed valve, a fourth connector is arranged at the water outlet end of the third ball valve, and the fourth connector is communicated with the second connecting pipe through a third connecting pipe.
According to the preferable scheme, a water separating tank is further arranged between the second connecting pipe and the vacuum pump, a fifth connector and a sixth connector are arranged on the surface of the water separating tank, the fifth connector is installed at one end, close to the bottom, of the side wall of the water separating tank, the sixth connector is installed at one end, close to the top, of the side wall of the water separating tank, the fifth connector is communicated with the second connecting pipe, and the sixth connector is communicated with the vacuum pump through a fourth connecting pipe.
According to one preferable scheme, the first connector, the second connector, the third connector, the fourth connector, the fifth connector and the sixth connector are all composed of sealing rings, connecting bolts, connecting nuts and fasteners.
According to one preferred scheme, the water-proof box comprises a water storage cavity and a cover, a sealing ring is arranged between the water storage cavity and the cover, and the water storage cavity is in threaded connection with the cover.
One of them preferred scheme, it includes sample cap upper portion and last sample cap lower part to go up the sample cap, sample cap includes sample cap upper portion and lower sample cap lower part down, the inner wall of fixed lamella corresponds the installation go up sample cap lower part with sample cap upper portion department is equipped with the recess down, be equipped with the rubber circle in the recess.
According to one preferred scheme, the saturated water tank comprises a tank cover and a tank body, the tank body is in threaded connection with the tank cover, and air holes are formed in the middle of the tank cover.
According to one preferred scheme, the cover body is in threaded connection with the fixed valve, four support lugs are arranged on the side faces of the two fixed valves respectively, and connecting holes are formed in the support lugs.
One of them preferred scheme, it is equipped with first well hollow groove to go up sample cap upper portion, first well hollow groove is close to third ball valve department has seted up first through-hole, it is equipped with a plurality of first round holes to go up sample cap lower part, and is a plurality of first round hole all with first well hollow groove intercommunication, sample cap upper portion is equipped with the second well hollow groove down, first well hollow groove is close to first ball valve and second ball valve department have seted up the second through-hole, sample cap lower part is equipped with a plurality of second round holes down, and is a plurality of the second round hole all with well hollow groove intercommunication in the second.
The method for preparing the saturated sample by using the triaxial compression test sample saturation device of the fine clay comprises the following steps:
(1) the preliminary preparation of a triaxial sample comprises the steps of firstly putting the sample into a latex film, sequentially putting filter paper, permeable stones and sample caps at two ends of the sample, then binding and fastening the latex film and the sample caps by adopting rubber rings, and finally connecting three valves with an upper sample cap and a lower sample cap and putting the valves between two fixed flaps;
(2) the two fixed flaps are connected by bolts and nuts, the cover body of the fixer is adjusted to be just contacted with the upper sample cap, the rest parts are installed, and meanwhile, the height of the water body in the water tank is ensured to be higher than the upper surface of the triaxial sample, and no water exists in the water-proof tank;
(3) closing a valve connecting the lower sample cap and the water tank, opening an upper valve and a lower valve at the sample cap, opening a vacuum pump, and keeping a negative pressure state for at least 2 hours;
(4) closing a valve for connecting the lower sample cap with the water-resisting tank, opening a connecting valve for connecting the water tank with the lower sample cap, and keeping the vacuum pump in an open state;
(5) after saturation for a certain time, firstly, turning off the vacuum pump, then draining water in the water tank and the water separating tank, disconnecting the connection between the valve and the connecting pipe, taking down the cover body of the fixer, unscrewing the bolt and the nut connected with the fixer, taking out the sample preparation assembly, sequentially taking down the rubber ring, the upper sample cap and the lower sample cap, keeping the saturated triaxial sample, the filter paper, the permeable stone and the latex film immovable, obtaining a sample preparation saturated part, and directly installing the sample preparation saturated part on a triaxial test instrument;
(6) and cleaning related parts, and airing for later use.
The invention has the beneficial effects that:
1) aiming at the small permeability coefficient of the fine clay, a saturation mode of vacuumizing the two ends of the sample is adopted, so that the vacuumizing efficiency is improved, and the saturation rate of the sample is effectively improved.
2) The sample is directly saturated in the latex film, so that the defect that gas exists between the sample and the latex film when the latex film is sleeved after the sample is saturated in the traditional method can be effectively avoided, and the saturation of the sample in the test can be effectively ensured.
3) Because the sample is saturated in the latex film, the defect that the sample is disturbed in the process of taking out the sample after the sample is saturated in a saturator in the traditional mode can be avoided, and the disturbance to the sample can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1,
in the drawing, 1-saturated water tank, 11-first connector, 12-first connection pipe, 13-second connector, 14-first ball valve, 15-vent, 2-sample preparation device, 21-holder, 211-cover, 212-stationary flap, 22-sample preparation assembly, 221-upper sample cap, 2211-upper sample cap, 2212-upper sample cap lower, 2213-first hollow groove, 2214-first through hole, 2215-first circular hole, 2216-second hollow groove, 2217-second through hole, 2218-second circular hole, 222-permeable stone, 223-filter paper, 224-sample, 225-lower sample cap, 3-vacuum pump, 31-second ball valve, 32-third connector, 33-second connection pipe, 34-a third ball valve, 35-a fourth connector, 36-a third connecting pipe, 4-a water separating tank, 41-a fifth connector, 42-a sixth connector, 43-a fourth connecting pipe, 44-a water storage cavity, 45-a cover, 46-a sealing ring, 5-a sealing ring, 6-a connecting bolt, 7-a connecting nut, 8-a fastening piece, 9-a rubber ring and 10-a support lug.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.
The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal, vertical or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not merely mean absolute parallelism, and because absolute equality is difficult to achieve in actual production and operation, certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present invention provides a technical solution: triaxial compression test sample saturation device of fine grain clay, including saturated water tank 1, sample preparation ware 2 and vacuum pump 3, saturated water tank 1 with first connector 11, first connecting pipe 12, second connector 13 and first ball valve 14 have connected gradually between the sample preparation ware 2, sample preparation ware 2 with second ball valve 31, third connector 32 and second connecting pipe 33 have connected gradually between the vacuum pump 3, sample preparation ware 2 includes fixer 21 and sample preparation subassembly 22, fixer 21 includes lid 211 and two fixed lamella 212, two fixed lamella 212 and lid 211 combination form inside fixer 21 for hollow structure, lid 211 and fixed lamella 212 cooperation form airtight cavity, sample preparation subassembly 22 locates in the airtight cavity, first connector 11 install in on saturated water tank 1, the first connector is communicated with the first connector 11 through the first connecting pipe 12, the water inlet end of the first ball valve 14 is communicated with the second connector 13, the water outlet end of the first ball valve 14 is communicated with the bottom of the fixed flap 212, the water inlet end of the second ball valve 31 is communicated with the bottom of the fixed flap 212, the water outlet end of the second ball valve 31 is communicated with the third connector 32, and the third connector 32 is communicated with the vacuum pump 3 through a second connecting pipe 33; sample preparation subassembly 22 includes sample cap 221, permeable stone 222, filter paper 223, sample 224, lower sample cap 225, sample 224 upper surface sets gradually from supreme down filter paper 223 permeable stone 222 with go up sample cap 221, and sample 224 lower surface sets gradually from last down filter paper 223 permeable stone 222 with sample cap 225 down, sample preparation subassembly 22 surface has still wrapped up the emulsion membrane. The invention can realize the aims of shortening the saturation time of the soil sample, improving the saturation of the soil sample, eliminating the air between the latex film and the soil sample and enabling the latex film to be tightly attached.
Preferably, a third ball valve 34 is arranged at the upper end of the fixed valve 212, the third ball valve 34 and the second ball valve 31 are symmetrically arranged on the outer surface of the fixed valve 212, a fourth connector 35 is arranged at the water outlet end of the third ball valve 34, and the fourth connector 35 is communicated with the second connecting pipe 33 through a third connecting pipe 36. The upper and lower two places are vacuumized simultaneously, the vacuumization time is further shortened, the soil sample saturation accuracy is higher, and the accuracy of the experimental result is further improved from the sample 224.
Preferably, a water separating box 4 is further arranged between the second connecting pipe 33 and the vacuum pump 3, a fifth connector 41 and a sixth connector 42 are arranged on the surface of the water separating box 4, the fifth connector 41 is installed at one end, close to the bottom, of the side wall of the water separating box 4, the sixth connector 42 is installed at one end, close to the top, of the side wall of the water separating box 4, the fifth connector 41 is communicated with the second connecting pipe 33, and the sixth connector 42 is communicated with the vacuum pump 3 through a fourth connecting pipe 43. The water-proof tank 4 can deposit the water that is mingled with in the vacuum pumping process in the 4 bottoms of water-proof tank, plays the effect that the water proof separates the gas, during steam gets into vacuum pump 3 when preventing the saturation, influences vacuum pump 3 and normally works.
Preferably, the first connector 11, the second connector 13, the third connector 32, the fourth connector 35, the fifth connector 41 and the sixth connector 42 are all composed of a sealing ring 5, a connecting bolt 6, a connecting nut 7 and a fastener 8.
Preferably, the water-separating tank 4 comprises a water storage cavity 44 and a cover 45, a sealing ring 46 is arranged between the water storage cavity 44 and the cover 45, and the water storage cavity 44 is in threaded connection with the cover 45.
Preferably, the upper sample cap 221 comprises an upper sample cap 221 upper portion and an upper sample cap 221 lower portion, the lower sample cap 225 comprises a lower sample cap 225 upper portion and a lower sample cap 225 lower portion, a groove is formed in the inner wall of the fixing flap 212 where the upper sample cap 221 lower portion and the lower sample cap 225 upper portion are correspondingly installed, and a rubber ring 9 is arranged in the groove.
Preferably, the saturated water tank 1 comprises a tank cover and a tank body, the tank body is in threaded connection with the tank cover, and the middle of the tank cover is provided with air holes 15. At triaxial sample saturation in-process, the surface of water should be higher than sample 224 upper surface all the time in the water tank, guarantees to form the flood peak poor, is favorable to triaxial sample saturation, and rethread bleeder vent 15 guarantees the inside and atmosphere intercommunication of water tank, avoids forming the negative pressure in saturation in-process water tank inside, hinders soil sample saturation process, makes the whole process of preparation saturation sample more smooth.
Preferably, the cover body 211 and the fixed valve 212 are connected by threads, four support lugs 10 are respectively arranged on the side surfaces of the two fixed valves 212, and the support lugs 10 are provided with connecting holes. The threaded connection is convenient to assemble and disassemble.
Preferably, a first hollow groove 2213 is arranged at the upper part of the upper sample cap 221, a first through hole 2214 is formed at the position, close to the third ball valve 34, of the first hollow groove 2213, a plurality of first circular holes 2215 are arranged at the lower part of the upper sample cap 221, the plurality of first circular holes 2215 are communicated with the first hollow groove 2213, a second hollow groove 2216 is arranged at the upper part of the lower sample cap 225, second through holes 2217 are formed at the positions, close to the first ball valve 14 and the second ball valve 31, of the first hollow groove 2213, a plurality of second circular holes 2218 are arranged at the lower part of the lower sample cap 225, and the plurality of second circular holes 2218 are communicated with the second hollow groove 2216.
The method for preparing the saturated sample by using the triaxial compression test sample saturation device of the fine clay comprises the following steps:
(1) the preliminary preparation of the triaxial sample 224, firstly putting the sample 224 into a latex film, sequentially putting filter paper 223, a permeable stone 222 and a sample cap at two ends of the sample 224, then binding and fastening the latex film and the sample cap by using a rubber ring 9, and finally connecting three valves with an upper sample cap 225 and a lower sample cap 225 and putting the valves between two fixed petals 212;
(2) the two fixing flaps 212 are connected by bolts and nuts, the cover body 211 of the fixer 21 is adjusted to be just contacted with the upper sample cap 221, the rest parts are installed, and meanwhile, the height of the water body in the water tank is higher than the upper surface of the triaxial sample, and no water exists in the water-resisting tank 4;
(3) closing a valve connecting the lower sample cap 225 with the water tank, opening an upper valve and a lower valve at the sample cap, opening the vacuum pump 3, providing negative pressure by the vacuum pump 3 at the moment, and enabling gas in the triaxial sample to overflow and disperse through the filter paper 223, the permeable stone 222 and the upper (lower) sample cap respectively due to the existence of the negative pressure in the water-resisting tank 4, so that the pore pressure of the sample 224 is negative, and keeping the negative pressure state for at least 2 hours;
(4) closing a valve connecting the lower sample cap 225 and the water-proof tank 4, opening a connecting valve connecting the water tank and the lower sample cap 225, and keeping the vacuum pump 3 in an open state; at this time, under the action of negative pressure, water in the water tank passes through the lower sample cap 225, the permeable stone 222, the filter paper 223, the triaxial sample, the filter paper 223, the permeable stone 222, the upper sample cap 221 and the connecting pipe in sequence through the connecting pipe, and finally enters the water separating tank 4. In the process, the water in the water tank can fill the internal pores of the triaxial sample, and after a certain period of saturation, the internal pores of the triaxial sample are filled with water finally, so that the triaxial sample reaches a saturated state.
(5) After a certain time of saturation, firstly closing the vacuum pump 3, then draining water in the water tank and the water-resisting tank 4, disconnecting the connection between a valve and a connecting pipe, taking down the cover body 211 of the fixer 21, unscrewing the bolt and the nut connected with the fixer 21, taking out the sample 224 preparation assembly 22, sequentially taking down the rubber ring 9 and the upper and lower sample caps 225, and keeping the saturated triaxial sample, the filter paper 223, the permeable stone 222 and the latex film still to obtain a sample preparation saturated part which is directly arranged on a triaxial test instrument; the selected experimental instrument is an unsaturated soil triaxial instrument (UNSAT) produced by Europe and America, the B value (saturation) of the sample is detected according to the requirement of a standard specification (GBT 50123-. Thus, a fine clay sample saturated by the apparatus of the present invention is considered to be saturated.
(6) And cleaning related parts, and airing for later use.
The reference to triaxial test techniques and methods is "Sean Rees", triaxial test techniques and methods.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
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| CN108398306A (en) * | 2018-05-11 | 2018-08-14 | 榆林学院 | A kind of saturation preparation of soil sample experimental rig and its method for making sample |
| CN110514502A (en) * | 2019-09-27 | 2019-11-29 | 南京工业大学 | Loose sand sample preparation equipment and method |
| CN217605418U (en) * | 2021-06-23 | 2022-10-18 | 四川省建筑科学研究院有限公司 | Triaxial compression test sample saturation device for fine clay |
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2021
- 2021-06-23 CN CN202110700005.5A patent/CN113281127A/en active Pending
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| JP2004239620A (en) * | 2003-02-03 | 2004-08-26 | Shimizu Corp | Testing method for impervious soil materials |
| CN204514684U (en) * | 2015-04-10 | 2015-07-29 | 山西省交通科学研究院 | A kind of test unit preparing saturated soil sample |
| CN108398306A (en) * | 2018-05-11 | 2018-08-14 | 榆林学院 | A kind of saturation preparation of soil sample experimental rig and its method for making sample |
| CN110514502A (en) * | 2019-09-27 | 2019-11-29 | 南京工业大学 | Loose sand sample preparation equipment and method |
| CN217605418U (en) * | 2021-06-23 | 2022-10-18 | 四川省建筑科学研究院有限公司 | Triaxial compression test sample saturation device for fine clay |
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